Plastic thermal barrier for use in constructing thermally insulated windows, doors, frames and the like



FIG. 1 is a perspective view of a plastic thermal barrier for use in constructing thermally insulated windows, doors, frames and the like shown fragmentarily to indicate indeterminate length;

FIG. 2 is a side view thereof;

FIG. 3 is a sectional view taken along line 3--3 of FIG. 2. 

The ornamental design for a plastic thermal barrier for use in constructing thermally insulated windows, doors, frames and the like, substantially as shown and described. 